Patents by Inventor Chung-Cheung C. Chu

Chung-Cheung C. Chu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8194649
    Abstract: Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: June 5, 2012
    Assignee: Rockstar BIDCO LP.
    Inventors: Rafi Rabipour, Chung Cheung C. Chu, Pierre Gendron, William Navarro, Paul Boudreaux
  • Publication number: 20100039949
    Abstract: Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
    Type: Application
    Filed: July 27, 2009
    Publication date: February 18, 2010
    Applicant: Nortel Networks Limited
    Inventors: Rafi Rabipour, Chung Cheung C. Chu, Pierre Gendron, William Navarro, Paul Boudreaux
  • Patent number: 7639601
    Abstract: Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: December 29, 2009
    Assignee: Nortel Networks Limited
    Inventors: Rafi Rabipour, Chung Cheung C. Chu, Pierre Gendron, William Navarro, Paul Boudreaux
  • Patent number: 7313115
    Abstract: Apparatus communicating with a mobile and a remote base station. The mobile is assumed to have a coding unit capable of operating in at least one mode selected from a set, each mode in the set being associated with a coding requirement. The set is characterized in that it has at least one mode that is associated with a greater coding requirement than a “designated” mode. Also, the apparatus comprises a control entity suitable to establish a tandem-free transfer of data received from the mobile to the remote base station. The control entity is operative to send control information to the mobile to cause the coding unit therein to operate in the designated mode prior to establishment of the tandem-free transfer. By forcing the mobile to operate in the designated mode, it is guaranteed that the tandem-free transfer can be achieved.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: December 25, 2007
    Assignee: Nortel Networks Limited
    Inventor: Chung Cheung C. Chu
  • Patent number: 7203226
    Abstract: A communication apparatus having a communication interface for communicating with a first remote entity, the first remote entity including a decoder capable of decoding data encoded according to a first encoding format. The communication apparatus includes a control entity operative to detect an attempt by a second remote entity to establish a TFO connection with the communication apparatus via the communication interface, for sending to the first remote entity, via the communication apparatus data encoded according to a second encoding format, different from the first encoding format, where the decoder at the first remote entity is incompatible with data encoded according to the second encoding format.
    Type: Grant
    Filed: November 14, 2002
    Date of Patent: April 10, 2007
    Assignee: Nortel Networks Limited
    Inventors: Rafi Rabipour, David Brombal, Chung Cheung C. Chu
  • Patent number: 7027989
    Abstract: The invention provides a method and apparatus for transmitting real-time data in a multi-access system which eliminates clipping of the data while reducing transmission delays. The invention can be incorporated in any multi-access system where transmission resources are allocated when there is information to transmit. In a preferred embodiment, the invention is incorporated in a multi-access wireless system for the upstream transmission of voice from a mobile station to a base station. Each speech segment received at the mobile is shortened by appropriate editing and buffered until transmission. By editing and buffering speech segments as they are received, clipping can be eliminated while reducing transmission delays.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: April 11, 2006
    Assignee: Nortel Networks Limited
    Inventors: Indranil Bob Tapadar, Karl D. Mann, Chung-Cheung C. Chu, Pierre P. Gendron
  • Patent number: 6766291
    Abstract: The invention relates to a method and apparatus for controlling the transition of a bypass capable codec between operative modes, based on a certain characteristic of the audio data signal processed by the codec. The apparatus relies on a control signal to determine when the codec will switch from one mode to another. This control signal reflects a characteristic of the audio data signal received at the apparatus, such as the type of speech activity or the format of the audio data signal. When in the active (non-bypass) mode, the apparatus relies on an additional control signal to switch to the inactive (bypass) mode. This additional control signal is received from a control unit at a remote codec that indicates that the remote codec is also bypass capable, hence the decoder at the first codec and the encoder at the remote codec can switch to the inactive mode to pass between them the compressed data frames.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: July 20, 2004
    Assignee: Nortel Networks Limited
    Inventors: Chung Cheung C. Chu, Rafi Rabipour, David G. Sloan
  • Patent number: 6721707
    Abstract: A signal processor for effecting the conversion of an audio data signal from one format to another. The signal processor has a signal converter that can selectively acquire two operative modes, namely a first operative mode and a second operative mode. In the first operative mode, the signal converter transforms the audio data signal from one format to another and releases the converted audio data signal from the output of the signal processor. In the second operative mode, the signal converter is disabled and permits passage of the audio data signal to the output without conversion. The signal processor has a control unit for controlling the transition of the signal converter between operative modes. The control unit enables the signal converter to pass from the first operative mode to the second operative mode when at least one operating condition has been satisfied.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: April 13, 2004
    Assignee: Nortel Networks Limited
    Inventors: Chung Cheung C. Chu, Rafi Rabipour, David G. Sloan
  • Publication number: 20040004957
    Abstract: Data communication apparatus including a port and a control entity. The control entity is operative to establish a connection with a remote entity over a first path and negotiate with the remote entity using in-band signaling over the first path establishment of a second path allowing the exchange of data between the data communication apparatus and the remote entity. The invention presents advantages from the standpoint of ease of implementation and bandwidth and resource savings. The use of an in-band messaging protocol to negotiate a establishment of the second path can be implemented generally in a straight forward manner. At the same time, the ability to transfer at least part of the connection to the second path avoids the drawbacks that would arise if that part of the connection were constrained to the first path. This feature allows the operator to take advantage of benefits provided by the second path but not available to the first path.
    Type: Application
    Filed: September 6, 2002
    Publication date: January 8, 2004
    Inventors: Rafi Rabipour, Chung Cheung C. Chu, Pierre Gendron, William Navarro, Paul Boudreaux
  • Publication number: 20030236909
    Abstract: Apparatus communicating with a mobile and a remote base station. The mobile is assumed to have a coding unit capable of operating in at least one mode selected from a set, each mode in the set being associated with a coding requirement. The set is characterized in that it has at least one mode that is associated with a greater coding requirement than a “designated” mode. Also, the apparatus comprises a control entity suitable to establish a tandem-free transfer of data received from the mobile to the remote base station. The control entity is operative to send control information to the mobile to cause the coding unit therein to operate in the designated mode prior to establishment of the tandem-free transfer. By forcing the mobile to operate in the designated mode, it is guaranteed that the tandem-free transfer can be achieved.
    Type: Application
    Filed: April 1, 2003
    Publication date: December 25, 2003
    Inventor: Chung Cheung C. Chu
  • Publication number: 20030210659
    Abstract: An audio communication apparatus having a first interface for communicating with a first remote entity that has a plurality of codecs that can be selectively enabled to process audio data, and a second interface for communicating with a second remote entity. The audio communication apparatus has a control entity for negotiating a TFO connection with the second remote entity by exchanging TFO control data with the second remote entity. During this exchange, the second remote entity sends to the control entity TFO control data conveying information identifying one or more codecs. The control entity includes a codec selector to select at least one codec of the first remote entity for processing audio data. The codec selection is based at least in part on the one or more codecs identified in the TFO control data sent by the second remote entity to the control entity and by the codecs available at the first remote entity.
    Type: Application
    Filed: August 30, 2002
    Publication date: November 13, 2003
    Inventors: Chung Cheung C. Chu, Rafi R. Rabipour, Peter P. Yue
  • Publication number: 20030125960
    Abstract: The invention relates to a method and apparatus for controlling the transition of a bypass capable codec between operative modes, based on a certain characteristic of the audio data signal processed by the codec. The apparatus relies on a control signal to determine when the codec will switch from one mode to another. This control signal reflects a characteristic of the audio data signal received at the apparatus, such as the type of speech activity or the format of the audio data signal. When in the active (non-bypass) mode, the apparatus relies on an additional control signal to switch to the inactive (bypass) mode. This additional control signal is received from a control unit at a remote codec that indicates that the remote codec is also bypass capable, hence the decoder at the first codec and the encoder at the remote codec can switch to the inactive mode to pass between them the compressed data frames.
    Type: Application
    Filed: June 18, 1999
    Publication date: July 3, 2003
    Inventors: CHUNG CHEUNG C. CHU, RAFI RABIPOUR, DAVID G. SLOAN
  • Patent number: 6483857
    Abstract: The invention relates to a method and apparatus for transmitting control information over an audio data stream, such as PCM coded speech information. The device comprises a control unit having two inputs receiving the PCM speech samples and control information signal. Each PCM sample is made up of a plurality of bits arranged according to different significance positions, such as position 0, 1, 2, 3, _N, where N+1 is the number of bits in the sample. The control unit receives a selected sample and shifts a bit at a selected significance position to a lower significance position. The empty slot at the predetermined significance position is used to receive a bit from the control information signal. The compound signal thus obtained is then released over a transport path, such as a T1 link, for transmission to a remote location.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: November 19, 2002
    Assignee: Nortel Networks Limited
    Inventors: David G. Sloan, Chung Cheung C. Chu